WO2014167066A1 - Réseau de communication mobile et procédé d'exploitation d'un réseau de communication mobile - Google Patents

Réseau de communication mobile et procédé d'exploitation d'un réseau de communication mobile Download PDF

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Publication number
WO2014167066A1
WO2014167066A1 PCT/EP2014/057296 EP2014057296W WO2014167066A1 WO 2014167066 A1 WO2014167066 A1 WO 2014167066A1 EP 2014057296 W EP2014057296 W EP 2014057296W WO 2014167066 A1 WO2014167066 A1 WO 2014167066A1
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WO
WIPO (PCT)
Prior art keywords
backhaul
base stations
network
capacity
backhaul network
Prior art date
Application number
PCT/EP2014/057296
Other languages
English (en)
Inventor
Peter Rost
Athul Prasad
Original Assignee
Nec Europe Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nec Europe Ltd. filed Critical Nec Europe Ltd.
Publication of WO2014167066A1 publication Critical patent/WO2014167066A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/38—TPC being performed in particular situations
    • H04W52/386—TPC being performed in particular situations centralized, e.g. when the radio network controller or equivalent takes part in the power control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/02—Resource partitioning among network components, e.g. reuse partitioning
    • H04W16/06—Hybrid resource partitioning, e.g. channel borrowing
    • H04W16/08—Load shedding arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/02—Arrangements for optimising operational condition
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/02—Resource partitioning among network components, e.g. reuse partitioning
    • H04W16/04—Traffic adaptive resource partitioning
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0203—Power saving arrangements in the radio access network or backbone network of wireless communication networks
    • H04W52/0206—Power saving arrangements in the radio access network or backbone network of wireless communication networks in access points, e.g. base stations
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/06—TPC algorithms
    • H04W52/14—Separate analysis of uplink or downlink
    • H04W52/143—Downlink power control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/34—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
    • H04W52/343—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading taking into account loading or congestion level
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present invention relates to a method for operating a mobile communication network, comprising a radio access network and a backhaul network, wherein the radio access network and the backhaul network are connected with each other for data communication and wherein the radio access network comprises one or more base stations, preferably small-cell base stations, to which users can connect with their mobile devices.
  • the present invention further relates to a mobile communication network, comprising a radio access network and a backhaul network, wherein the radio access network and the backhaul network are connected with each other for data communication and wherein the radio access network comprises one or more base stations, preferably small-cell base stations, to which users can connect with their mobile devices, preferably for performing with a method according to one of the claims 1 -13.
  • the present invention even further relates to a backhaul resource controller connected to or being part of a mobile communication network comprising a radio access network and a backhaul network, wherein the radio access network and the backhaul network are connected with each other for data communication and wherein the radio access network comprises one or more base stations, preferably small-cell base stations, to which users can connect with their mobile devices, preferably for performing with a method according to one of the claims 1 -13 and/or with a mobile communication network according to claim 14.
  • a method for operating a mobile communication network comprising a radio access network and a backhaul network, wherein the radio access network and the backhaul network are connected with each other for data communication and wherein the radio access network comprises one or more base stations, preferably small-cell base stations, to which users can connect with their mobile devices.
  • the method is characterized in that a) the backhaul network capacity is determined and that b) the radio capabilities of one or more of the base stations is adapted, preferably by the corresponding base station itself, depending on the determined backhaul network capacity.
  • a mobile communication network comprising a radio access network and a backhaul network, wherein the radio access network and the backhaul network are connected with each other for data communication and wherein the radio access network comprises one or more base stations, preferably small-cell base stations, to which users can connect with their mobile devices, preferably for performing with a method according to one of the claims 1 -13.
  • the mobile communication network is characterized in that a) a backhaul resource controller and/or one or more of the base stations are operable to determine the backhaul network capacity and that b) one or more of the base stations are operable to adapt their radio capabilities depending on the determined backhaul network capacity.
  • a backhaul resource controller is defined connected to or being part of a mobile communication network, comprising a radio access network and a backhaul network, wherein the radio access network and the backhaul network are connected with each other for data communication and wherein the radio access network comprises one or more base stations, preferably small-cell base stations, to which users can connect with their mobile devices, preferably for performing with a method according to one of the claims 1 -13 and/or with a system according to claims 14.
  • the backhaul resource controller is characterized in that the backhaul resource controller is operable to determine and/or to receive the backhaul network capacity and to initiate the one or more of the base stations to adapt their radio capabilities depending on the determined and/or received backhaul network capacity.
  • the radio access network capacity may be actively adapted based on the backhaul resource network capacity. Therefore the risk of congestion is distributed more evenly.
  • the invention it has been further recognized that a joint optimization of the backhaul network as well as the radio access network operation is enabled. According to the invention it has been even further recognized that user experience can be improved. According to the invention it has been even further recognized that the operation expenditures as well as the capital expenditures for the mobile communication network can be reduced since non-ideal backhaul networks can be used instead of expensive ideal backhaul networks. According to the invention it has been even further recognized that backhaul capacity limited base stations can be easily integrated into a mobile communication network.
  • the backhaul network capacity is based on the backhaul link capacity indicating the capacity of the connection links between the one or more base stations and the backhaul network. This enables to adapt the radio capabilities of the radio access network based on the backhaul link capacities which limit the maximum throughput on each backhaul link. These individual capacities may change over time due to changing weather conditions, for example obstacles on a direct line-of-sight connection and other environmental changes. Therefore an efficient adaption of the radio access network to the changing backhaul link connections is provided.
  • adapting the radio capabilities include an increase or decrease in power of a base station. This enables for example to change the downlink power, the downlink power control or the power control for a carrier aggregation. Thus, flexibility is further enhanced as well as an easy adaption of radio capabilities is provided.
  • downlink power is increased or reduced, preferably in selected spectral regions.
  • the base station may reduce or increase its emitted signal power in order to increase or decrease the cell size such that a cell with high backhaul capacity may also support a larger cell size.
  • the base station may select to decrease or increase the power on certain spectral regions. For example if too many users have a similar path loss towards their base station then only a few of them are offloaded.
  • different power control levels are applied to different carriers within a carrier aggregation system.
  • the base station may apply different power control levels to different carriers in order to offload users and to have different cell sizes for each carrier.
  • flexibility and efficiency is further enhanced.
  • adapting the radio capabilities include increasing or reducing a size of the cell of a base station, preferably by altering the cell range extension parameter. This enables in an efficient and fast way to change the cell range extension, i.e. to extend or reduce the cell size. Thus flexibility is further enhanced.
  • the base stations negotiate their cell sizes, preferably only adjacent base stations. This enables to further enhance the flexibility and provides an enhanced operation of the mobile communication network when adjacent base stations negotiate their cell sizes with each other.
  • a further advantage is that communication does not have to be performed via a centralized entity or via the backhaul network.
  • the negotiation is performed by a centralized entity, preferably implemented as a self-organizing network, in particular taking into account the load of different cells of base stations and/or via one or more P2P connections, preferably via an X2 interface.
  • a negotiation performed by a centralized entity enables a centralized coordination of the negotiation not only of adjacent base stations but also of other base stations, so that an overall optimization of the cell sizes of all base stations can be performed.
  • a peer-to-peer connection preferably via a X2 interface a direct negotiation between the base stations is possible and preferably the 3GPP-X2- interface can be used for the communication related to the negotiation.
  • the backhaul network capacity is determined by a centralized entity, wherein the centralized entity then informs the base stations about the determined backhaul network capacity and the base stations then use the provided backhaul network capacity for adapting their radio capabilities.
  • the centralized entity informs the base stations about the determined backhaul network capacity and the base stations then use the provided backhaul network capacity for adapting their radio capabilities.
  • the adaption of the base stations may be performed selectively, i.e. not all base stations may be provided with the backhaul network capacity, so that they do not adapt their radio capabilities.
  • One of the advantages is, that then for example a centralized access to this centralized entity, for example by an operator, is possible to provide rules for adaption or for defining the backhaul network capacity the backhaul link capacity, etc.. Thus, efficiency is enhanced.
  • the cell size of a base station is adapted linearly based on the determined backhaul network capacity.
  • the cell size of each base station is chosen as a linear dependency on the available backhaul network capacity, i.e. that the size of the base station i be A then
  • Ci, C ⁇ denote the backhaul link capacity between the corresponding base station in the radio access network and a corresponding receiving entity in the backhaul network ensuring that the probability of congestion is equal in each cell.
  • the cell size may then be chosen such that it refers to the actual physical cell size, the maximum path-loss between the base station and a user equipment, an average throughput carried by the cell or the shared throughput carried by the cell or the like.
  • steps a) and b) are performed periodically and/or event-based. This ensures that whenever the backhaul network capacity, in particular the backhaul link capacity changes, then the radio capabilities are adapted correspondingly.
  • the centralized entity is provided in form of a pseudo base station. This enables to easily communication with other base stations without having to introduce additional interfaces or the like for a communication between the base stations. Thus integration is enhanced.
  • an unused field within an information exchange according to a communication protocol preferably a status message exchange between adjacent base stations, is used to report, preferably periodically, a backhaul link capacity.
  • Characteristic STRING bitmap indicates s (SIZE(32)) measurement
  • the table shows a resource status request message information as for example shown in the non-patent literature "3GPP TS 36.432, "E-UTRAN: X2 application protocol (X2AP) (release 1 1 )".
  • the fields after the 5 th bit are unused. Therefore one of these Bits may be set to "1" if a base station, preferably an eNodeB wants its neighboring base stations, preferably eNodeBs, to report periodically the backhaul link conditions. This bit could indicate to neighboring base stations to report backhaul conditions to the base stations.
  • the field "Cell To Report” indicates the cells of the base stations which need to report its backhaul link conditions to a serving base station, if a base station, preferably an eNodeB, has multiple cells. In the following table possible currently defined parameters in a response/update procedure are shown:
  • the field “backhaul status” may contain the following information elements:
  • the load indicator could be similarly defined according to 3GPP TS 36.432 "E- UTRAN: X2 application protocol (X2AP) (release 1 1 )".
  • Radio Resource Response/Update may be modified as shown below:
  • the base station here the eNodeBI
  • the base station may upon receiving the information above from neighboring cells change its radio capabilities, i.e. its parameters to adapt to the determined backhaul network capacity.
  • Fig. 1 shows a mobile communication system according to a first embodiment of the present invention
  • Fig. 2 shows part of a mobile communication network according to a second embodiment of the present invention
  • Fig. 3 shows steps of part of a method according to a third embodiment of the present invention
  • Fig. 4 shows steps of part of a method according to a fourth embodiment of the present invention.
  • Fig. 1 shows a mobile communication system according to a first embodiment of the present invention.
  • a backhaul resource controller BRC is shown which is connected to a local cluster of base stations BS within a radio access network RAN through an interface h. Furthermore the backhaul resource controller BRC is connected through an interface to the local backhaul infrastructure BN which delivers data to the base station cluster BS in the radio access network RAN.
  • the base stations BS are connected to the backhaul network via backhaul links BLC indicated by their backhaul link capacities
  • the backhaul link capacities C limit the maximum throughput on each backhaul link Ci, i.e. from each of the base stations BS to the backhaul network BN.
  • the backhaul resource controller BRC or each local base station BS may adapt its radio access stratum parameterization depending on the changing capacity C, of the backhaul network BN.
  • the backhaul resource controller BRC or the local base station BS may change the following parameters:
  • the base station BS may reduce or increase its emitted signal power in order to increase or decrease the cell size of the base station BS such that the cell with high backhaul capacity C, also supports a larger cell size of the base station BS.
  • the base station BS may selectively increase or decrease the power on certain spectral regions. In the case of too many users or user equipment UE respectively having a similar path loss towards the base station BS few of them could be offloaded by selectively increasing or decreasing the power on the certain spectral regions accordingly.
  • the base station BS may apply different power control levels to different carriers within a carrier aggregation system in order to offload users or user equipment UE respectively and to have different cell sizes for each carrier.
  • the base station BS may choose for example a favorable A3 offset according to 3GPP in order to offload users to adjacent cells of base stations BS if their connecting backhaul capacity C, is not sufficient.
  • the base station BS may alter the cell-range extension parameter CRE in order to extend or reduce the cell size.
  • a coordination with adjacent base station BS may be performed by the backhaul resource controller BRC, for example through proprietary interfaces or through direct peer-to-peer connections, such as the X2 interface according to 3GPP TS 36.432 "E-UTRAN: X2 application protocol (X2AP) (release 1 1 )" after measuring the backhaul network quality: For example the base stations BS measures the backhaul network quality and based on that result it negotiates with the one or more adjacent base stations BS a different cell size.
  • BRC backhaul resource controller
  • the parameterization may be performed either centrally by taking into account the load of different cells, which may be implemented as the self-organizing network (SON) or locally by each individual base station BS.
  • SON self-organizing network
  • Fig. 2 shows part of a mobile communication network according to a second embodiment of the present invention.
  • a radio access network RAN with a plurality of base stations BS is shown. Each base station is connected via an X2 interface to its adjacent base station BS. Further a proprietary interface is provided with the backhaul resource controller BRC which is connected to each base station BS individually.
  • the backhaul resource controller BRC could be implemented in any entity using a base station BS or an eNodeB which is aware of its backhaul link condition Ci.
  • the base stations BS are implemented in form of eNodeBs connected together using the X2 interface.
  • the eNodeBs which are collocated could also be provided in form of a cluster to communicate with each other as shown by the hexagons in Fig. 2.
  • the interface between the base stations BS in a cluster could be wired or over-the-air interface.
  • Fig. 3 shows steps of part of a method according to a third embodiment of the present invention.
  • a flow diagram of a method according to the invention is shown.
  • the eNodeB After the initial step SO to begin, in a first step S1 the eNodeB becomes aware that the backhaul conditions have changed. ln a second step S2 the eNodeB informs neighboring eNodeBs regarding the change in its backhaul conditions. In a third step S3 the neighboring eNodeBs change their network and/or radio parameters.
  • a fourth step S4 it is checked whether the change in the backhaul conditions are favorable or not.
  • a fifth step S5 no further steps are performed and if not then in a sixth step S6 the steps S2-S4 are performed again as long as the change in the conditions is not favorable.
  • an eNodeB becomes aware that backhaul conditions have changed. This could be based on a feedback from the backhaul resource controller BRC by using any other techniques such as backhaul link estimation or the like. Once this occurs the eNodeB informs neighboring eNodeBs regarding the change in parameters and request a change in neighboring eNodeB parameters based on this information. Alternatively the eNodeB could directly inform neighboring eNodeBs regarding which parameters need to be changed. This information could be exchanged periodically and/or in an event-triggered manner.
  • Fig. 4 shows steps of part of a method according to a fourth embodiment of the present invention.
  • Fig. 4 a signaling diagram for resource status request is shown as currently defined in 3GPP TS36.423 "E-UTRAN”: X2 application protocol (X2 AP) (release 1 1 ).
  • the first evolved NodeB eNB1 initiates a resource status request in a first step T1 to a second evolved NodeB eNB2.
  • the second evolved NodeB eNB2 replies with a resource status response back to the first evolved NodeB eNB1 in a second step T2.
  • the second evolved NodeB eNB2 reports a resource status failure back to the evolved NodeB eNB1.
  • the messages are sent between the first and second evolved NodeB eNB1 and eNB2.
  • a response message is sent if the request is successful else a failure message is sent.
  • Such a request for a resource status is described above, cf. the description with regard to the tables above.
  • the present invention enables to actively adapt the radio access network capacity by the backhaul resource controller depending on the backhaul network capacity in order to distribute a risk of congestion more easily.
  • the present invention enables that the cell size of a base station may be chosen linearly dependent on the available backhaul capacity while the definition of a cell size may differ.
  • the present invention has inter alia the following advantages:
  • the present invention optimizes jointly the backhaul network operation as well as the radio access network operation. Further the present invention improves user experience through enabling improved load balancing.
  • a further advantage is that the capital expenditures CAPEX and the operational expenditures OPEX for the mobile communication network are reduced because non-ideal backhaul network infrastructure may be used instead of expensive ideal one. Further the present invention enables to integrate backhaul-capacity-limited base stations.
  • the present invention can be easily integrated in conventional mobile communication systems and increases the efficiency as well as the flexibility and even user experience.

Abstract

La présente invention concerne un procédé d'exploitation d'un réseau de communication mobile, comprenant un réseau d'accès radio et un réseau d'amenée. Le réseau d'accès radio et le réseau d'amenée sont connectés l'un à l'autre pour la transmission de données et le réseau d'accès radio comprend une ou plusieurs stations de base, de préférence des stations de base à petites cellules, auxquelles des utilisateurs peuvent se connecter au moyen de leur dispositif mobile. La capacité du réseau d'amenée est déterminée et la capacité radio d'une ou plusieurs des stations de base (BS) est adaptée, de préférence par les stations de base elles-mêmes, en fonction de la capacité déterminée du réseau d'amenée.
PCT/EP2014/057296 2013-04-10 2014-04-10 Réseau de communication mobile et procédé d'exploitation d'un réseau de communication mobile WO2014167066A1 (fr)

Applications Claiming Priority (2)

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EP13163198.8 2013-04-10
EP13163198 2013-04-10

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Cited By (2)

* Cited by examiner, † Cited by third party
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WO2017152982A1 (fr) 2016-03-10 2017-09-14 Telefonaktiebolaget Lm Ericsson (Publ) Appareil et procédé de contrôle d'utilisation d'une liaison fronthaul dans un réseau de communications sans fil
US11581920B2 (en) 2018-08-08 2023-02-14 Sony Mobile Communications Inc. Multiple transmission panels and non-ideal backhaul links

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017152982A1 (fr) 2016-03-10 2017-09-14 Telefonaktiebolaget Lm Ericsson (Publ) Appareil et procédé de contrôle d'utilisation d'une liaison fronthaul dans un réseau de communications sans fil
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US11581920B2 (en) 2018-08-08 2023-02-14 Sony Mobile Communications Inc. Multiple transmission panels and non-ideal backhaul links

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